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Weather in Kōyasan for May 2026

Your guide to Kōyasan weather in May - trends and predictions

    Temperatures

  • Until now, May 2026 in Kōyasan has been nearly identical to the historical average, with a temperature of 22.2 °C (showing only a slight deviation of 0 °C).

  • The forecast for the next days in Kōyasan predicts temperatures to be around 25 °C, close to the historical average.

  • In general, the average temperature in Kōyasan at the beginning of May is 19.6 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 26.9 °C by the end of May.

    • Rain 🌧️

  • Kōyasan in May brings notable rainfall, with an average of 20 rainy days and a total precipitation of 291.9 mm.

    • More

  • Is May a good time to visit Kōyasan? check out the best time to travel to Kōyasan page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
11
Dry days
Average rainy days
20
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/11°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Kōyasan Weather May

Move between months or click on a day
April
June
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Cloudy
20°
2
Moderate or heavy rain shower
19°
3
Partly cloudy
21°
4
Patchy rain possible
19°
5
Overcast
20°
6
Moderate or heavy rain shower
17°
7
Overcast
21°
8
Overcast
22°
9
Moderate or heavy rain shower
18°
10
Heavy rain at times
22°
11
Patchy rain possible
20°
12
Patchy rain possible
21°
13
Sunny
23°
14
Overcast
24°
15
Cloudy
25°
16
Moderate rain at times
25°
17
Moderate or heavy rain shower
25°
18
Heavy rain at times
28°
19
Cloudy
25°
20
Partly cloudy
27°
21
Moderate or heavy rain shower
27°
22
Moderate rain
20°
23
Patchy rain possible
24°
24
Patchy rain possible
23°
25
Sunny
26°
26
Sunny
29°
27
Partly cloudy
30°
28
Heavy rain
21°
29
Sunny
26°
30
Sunny
28°
31
Sunny
28°

Temperatures trend during May in Kōyasan

See the weather trend as well as the moving average line

May weather in Kōyasan day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
1 May Cloudy
Cloudy
 20° /9° 12.4 mm 4
2 May Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /10° 17 mm 7
3 May Partly cloudy
Partly cloudy
 21° /9° 4.5 mm 6
4 May Patchy rain possible
Patchy rain possible
 19° /9° 5 mm 4
5 May Overcast
Overcast
 20° /6° 0 mm 8
6 May Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /10° 18.2 mm 5
7 May Overcast
Overcast
 21° /11° 2.2 mm 5
8 May Overcast
Overcast
 22° /7° 0.4 mm 7
9 May Moderate or heavy rain shower
Moderate or heavy rain shower
 18° /9° 10.6 mm 7
10 May Heavy rain at times
Heavy rain at times
 22° /10° 5.8 mm 8
11 May Patchy rain possible
Patchy rain possible
 20° /9° 3.4 mm 7
12 May Patchy rain possible
Patchy rain possible
 21° /10° 2.4 mm 6
13 May Sunny
Sunny
 23° /11° 1.1 mm 5
14 May Overcast
Overcast
 24° /11° 0.2 mm 8
15 May Cloudy
Cloudy
 25° /10° 0 mm 8
16 May Moderate rain at times
Moderate rain at times
 25° /11° 0.7 mm 8
17 May Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /14° 10 mm 8
18 May Heavy rain at times
Heavy rain at times
 28° /15° 1.1 mm 8
19 May Cloudy
Cloudy
 25° /14° 0 mm 8
20 May Partly cloudy
Partly cloudy
 27° /15° 3.2 mm 6
21 May Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /19° 18.3 mm 6
22 May Moderate rain
Moderate rain
 20° /16° 5.8 mm 4
23 May Patchy rain possible
Patchy rain possible
 24° /14° 0.7 mm 4
24 May Patchy rain possible
Patchy rain possible
 23° /15° 4.7 mm 4
25 May Sunny
Sunny
 26° /14° 0 mm 5
26 May Sunny
Sunny
 29° /15° 0 mm 6
27 May Partly cloudy
Partly cloudy
 30° /16° 0.1 mm 6
28 May Heavy rain
Heavy rain
 21° /16° 26.4 mm 4
29 May Sunny
Sunny
 26° /13° 0 mm 5
30 May Sunny
Sunny
 28° /14° 0 mm 6
31 May Sunny
Sunny
 28° /15° 0 mm 6
Next
Important Notice
Our weather forecast for Kōyasan in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Kōyasan forecast closer to your planned date for the most up-to-date weather information.
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Kōyasan weather in May vs April vs June

Compare May weather in Kōyasan with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AprilMayJune
WeatherModerate or heavy rain shower
Moderate or heavy rain shower
Moderate or heavy rain shower
Moderate or heavy rain shower
Patchy rain possible
Patchy rain possible
Temperatures18°/7°21°/11°26°/16°
Rainfall112 mm292 mm182 mm
Wind14.1 km/h12.2 km/h11.2 km/h
Humidity68%78%78%
Rainy days14 days20 days16 days
Dry days16 days11 days14 days

Planning a trip to Kōyasan? Discover the best time to visit

Kōyasan in May - FAQ

What are the expected maximum and minimum temperatures in Kōyasan during May?

Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Kōyasan during May?

Significant rainfall exceeding 291.9 mm is expected in Kōyasan during May, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Kōyasan during May?

The average wind speed in Kōyasan during May is 12 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Kōyasan in May?

As you prepare for your trip to Kōyasan in May, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Kōyasan, during May, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

May rainfall patterns in Kōyasan

Explore the daily rainfall trends and prepare for Kōyasans May weather 💧
Typically, Kōyasan has 20 rainy days in May with a total of 291.9 mm of rainfall.

UV exposure in Kōyasan during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

Quick links

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Location coordinates Where is Kōyasan?

Get accurate weather forecasts for Kōyasan, located at latitude 34.217 and longitude 135.583. Stay updated with localized weather information tailored for Kōyasan.

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